Im having a Winlogon.exe XP boot issue

Hello Experts!!!
I'm getting a error message when a computer boots up.
winlogon.exe - Unable to locate component
This application has failed to start because sfc_os.dll was not found. Re-installing the application may fix this problem.
Is there a solution for this? If I click OK, the box goes away and the computer starts and seems to run fine.
Thanks for the help......Don

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Have you done a Search for the file? It should be located at: C:\Windows\System32
If not, then: Start>Run>type CMD>press OK
At the blinking cursor type sfc /scannow (space between c and /)
Have your XP reinstallation CD ready to insert.
sfc = system file checker, it scans your harddrive for corrupt or missing system
files and ask you if you want to replace/install them.

Hi all
Thanks for the responces. I tried the sfc /scannow at the CMD prompt. The same error message came up soon as I press Enter. I also replaced the os_sfc.dll with a file from another machine.....same error message occured......Hmmm????
Don

Ok....I figured it out. The sfc_os.dll file that I made a copy of...I put in the wrong folder. I went back and took a closer look. The file goes in the Windows/system32 folder. After that all is well. Thanks for your time............ Don

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